[namllihs]

I think you need to decide what features are important to you for the sports you shoot, make a list of the cameras that offer some or all of these features and then go to your local friendly dealer and handle the said cameras. You will want a camera that is comfortable in the hand and has easy to reach controls. Remember that when you buy a DSLR you are buying into a system. I think you will probably come down to a choice between Nikon and Canon, although I know a few people who shoot motor sport with Konica/Minolta. When you are out shooting for hours on end you want a camera that is comfortable to hold and intuitive to use. Whatever you choose, enjoy what you are doing and share the results with us.
Good Luck.